Author Topic: System80 power train  (Read 276 times)

0 Members and 1 Guest are viewing this topic.

Offline Retropin

  • Trade Count: (+4)
  • ******
  • Forum Posts:
Re: System80 power train
« on: May 17, 2012, 07:30:28 PM »
Amazing what having a diagram can do!

Non working coils is due to a dodgy interboard connector... ground on far right wasnt in place... need a new one of these.

Drop target making kick out coil fire was in the end a faulty 7404 @ Z12... looking through the schematic i think only one gate is used on this chip. I went to test the gate and saw that one leg wasnt in the socket..LOL.
 Replaced chip and problem solved.

Couple of switches not working.... one dead display. 2 drops that are like bricks!

Apart from that... all good!!!!